Green liquor extraction of hemicelluloses from southern pine in an Integrated Forest Biorefinery

摘要: Abstract Loblolly Pine chips were extracted with fresh green liquor solutions containing sufficient alkalinity to approximately neutralize the acids released upon treatment of chip-liquor mass at elevated temperatures 170, 180 and 190 °C for various times. The components extracts then quantified using high pressure anion exchange chromatography UV spectrophotometer. time–temperature effect on yields including wood weight loss after extraction could be well described by H-factor approach. Sugar all found in their polymeric forms liquor. About 2.5–3% was as total sugars an about 4000. In general, mannose showed lower than xylose. With increasing chemical charge, arabinoglucuronoxylan galactoglucomannan decreased, whereas dissolved lignin increased. Cellulose a minimum dependence charge. sugar inverse proportionality final pH that rapidly dropped from alkali neutral very early stages leveled off slowly reaching acid region. Significant difference between organic yield provides possible evidence presence significant amount low molecular organics not accounted for.